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Finding the Fourth Proportional to 3.21, 4.79 and 2.91

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Solution

The fourth proportional to 3.21, 4.79 and 2.91 is: 4.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.21 : 4.79 = 2.91 : x
  2. Step 2: Convert to fraction form
    3.21/4.79 = 2.91/x
  3. Step 3: Cross multiply
    3.21x = 4.79 × 2.91
  4. Step 4: Simplify right side
    3.21x = 13.94
  5. Step 5: Solve for x
    x = 13.94/3.21
  6. Step 6: Final answer
    x = 4.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.